Surgeon Vladimir Knyazev, nicknamed Monomakh, goes to meet his former nurse, finds her dead and becomes suspected of committing a brutal murder. Soon, in a similar manner - with a scalpel to the throat - two more nurses, one way or another connected with Monomakh, are killed, and now the respected doctor can no longer get away with it: he is guaranteed to be labeled a maniac-killer. Unless... the clever investigator Alla Surkova, who is secretly in love with Monomakh and is capable of putting together a puzzle of seemingly disparate criminal stories, doesn’t get down to business...